Poppy Jamie, Lucy Hale, Charli XCX (+), Kesha, Alexandra Shipp, Harley Morenstein, Greer Grammer, 5 Seconds of Summer, Michael Clifford, Luke Hemmings, Calum Hood, Ashton Irwin, Becky G, Brandi Cyrus, Ashley Rickards, Jenn McAllister, Andrea Russett, Rebecca Black, Ricky Dillon, Alex Steele with Cassie Steele, Katherine McNamara, DJ Mustard, Zac Pullam with Cynthia Watros, Bianca A Santos, Maddie Ziegler, Jeremy Scott, Smosh, Anthony Padilla with Ian Hecox, Abby Lee Miller with Melissa Gisoni, Rita Volk, Echosmith, Noah Sierota, Sydney Sierota, Graham Sierota, Jamie Sierota, MKTO aka Malcolm Kelley, Jessie J, Fifth Harmony, Camila Cabello, Ally Brooke Hernandez, Dinah Jane Hansen, Lauren Jauregui, Normani Kordei, Scooter Braun (+), Sarah Hyland, Ariana Grande, Jack Antonoff, Molly Tarlov, Jillian Rose Reed, Arden Cho, Nick Jonas with Olivia Culpo, Amber Rose (+) with Wiz Khalifa, Victoria Justice with Pierson Fode (+), Jourdan Dunn, Bobby Lashley with guest, White Arrows, Marcus Haney with Christopher Lorello, Juicy J with guest, Ireland Baldwin with Angel Haze, Natasha Galkina, Nev Schulman with guest, Laverne Cox with guest, Tyler Posey with Seana Gorlick, Holland Roden, Chanel Iman, Dylan Sprayberry (brief), Camille Guaty, DJ Cassidy, Solange Knowles, Frank Gatson with Luke James, Chanel West Coast, Jordin Sparks with Jason Derulo and mom, Dr Jenn Berman, Neil Portnow with guest, Sam Smith, Kiesza, Ed Sheeran with Emil Nava, Nicki Minaj, Gwen Stefani, Julianne Hough, Iggy Azalea with Nick Young, Nina Dobrev, Casper Smart (+), Taylor Swift (+), Maroon 5, Mickey Madden, Jesse Carmichael, James Valentine, Matt Flynn, PJ Morton, Adam Levine with Behati Prinsloo (+), Taye Diggs with Amanza Smith, Taylor Swift, Michelle Williams (singer), Miley Cyrus (+), Kelly Rowland, Dylan OBrien, Snoop Dogg with Cori Broadus, Chloe Grace Moretz, Miley Cyrus, Jennifer Lopez, Demi Lovato, Carla DiBello, Kim Kardashian, Kendall Jenner, Kylie Jenner, Usher Raymond, Common, Rita Ora (+), Cher Lloyd, Charli XCX (performance), Uzo Aduba, Darren Criss, Chris Brown (+) with Tyga, Austin Mahone (+), Taylor Schilling, Katy Perry with Riff Raff, Trey Songz with guests, Jamie Chung, Beyonce Knowles,
